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Additional Information - Summary of Movement in Capitalised Exploratory Well Costs (Parenthetical) (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Exploration and evaluation assets [member]
Disclosure Of Detailed Information About Exploration And Evaluation [Line Items]
Impairment losses	$ 1,557

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- Definition

Disclosure Of Detailed Information About Exploration And Evaluation.

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- Definition

Impairment losses on capitalised exploratory well costs.

+ References

No definition available.

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